1221010001212 has 12 divisors (see below), whose sum is σ = 2182230640800. Its totient is φ = 597515532416.

The previous prime is 1221010001209. The next prime is 1221010001243. The reversal of 1221010001212 is 2121000101221.

It is a junction number, because it is equal to n+sod(n) for n = 1221010001192 and 1221010001201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3247366837 + ... + 3247367212.

It is an arithmetic number, because the mean of its divisors is an integer number (181852553400).

Almost surely, 2^{1221010001212} is an apocalyptic number.

It is an amenable number.

1221010001212 is a deficient number, since it is larger than the sum of its proper divisors (961220639588).

1221010001212 is a wasteful number, since it uses less digits than its factorization.

1221010001212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6494734100 (or 6494734098 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221010001212 its reverse (2121000101221), we get a palindrome (3342010102433).

The spelling of 1221010001212 in words is "one trillion, two hundred twenty-one billion, ten million, one thousand, two hundred twelve".